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    <li><a href="#什么是运算符">什么是运算符？</a></li>
    <li><a href="#python算术运算符">Python算术运算符</a></li>
    <li><a href="#实例python-30">实例(Python 3.0+)</a></li>
    <li><a href="#python比较运算符">Python比较运算符</a></li>
    <li><a href="#实例python-30-1">实例(Python 3.0+)</a></li>
    <li><a href="#python赋值运算符">Python赋值运算符</a></li>
    <li><a href="#实例python-30-2">实例(Python 3.0+)</a></li>
    <li><a href="#python位运算符">Python位运算符</a></li>
    <li><a href="#实例python-30-3">实例(Python 3.0+)</a></li>
    <li><a href="#python逻辑运算符">Python逻辑运算符</a></li>
    <li><a href="#实例python-30-4">实例(Python 3.0+)</a></li>
    <li><a href="#python成员运算符">Python成员运算符</a></li>
    <li><a href="#实例python-30-5">实例(Python 3.0+)</a></li>
    <li><a href="#python身份运算符">Python身份运算符</a></li>
    <li><a href="#实例python-30-6">实例(Python 3.0+)</a></li>
    <li><a href="#python运算符优先级">Python运算符优先级</a></li>
    <li><a href="#实例python-30-7">实例(Python 3.0+)</a></li>
    <li><a href="#实例">实例</a></li>
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            <h1 class="post-title">Python3运算符</h1>
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            2021年9月15日
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            <h1 id="python3-运算符">Python3 运算符</h1>
<hr>
<h2 id="什么是运算符">什么是运算符？</h2>
<p>本章节主要说明 Python 的运算符。</p>
<p>举个简单的例子:</p>
<pre><code>4 + 5 = 9
</code></pre><p>例子中，<strong>4</strong> 和 <strong>5</strong> 被称为<strong>操作数</strong>，<strong>+</strong> 称为<strong>运算符</strong>。</p>
<p>Python 语言支持以下类型的运算符:</p>
<ul>
<li><a href="https://www.runoob.com/python3/python3-basic-operators.html#ysf1">算术运算符</a></li>
<li><a href="https://www.runoob.com/python3/python3-basic-operators.html#ysf2">比较（关系）运算符</a></li>
<li><a href="https://www.runoob.com/python3/python3-basic-operators.html#ysf3">赋值运算符</a></li>
<li><a href="https://www.runoob.com/python3/python3-basic-operators.html#ysf4">逻辑运算符</a></li>
<li><a href="https://www.runoob.com/python3/python3-basic-operators.html#ysf5">位运算符</a></li>
<li><a href="https://www.runoob.com/python3/python3-basic-operators.html#ysf6">成员运算符</a></li>
<li><a href="https://www.runoob.com/python3/python3-basic-operators.html#ysf7">身份运算符</a></li>
<li><a href="https://www.runoob.com/python3/python3-basic-operators.html#ysf8">运算符优先级</a></li>
</ul>
<p>接下来让我们一个个来学习Python的运算符。</p>
<hr>
<h2 id="python算术运算符">Python算术运算符</h2>
<p>以下假设变量 <strong>a=10</strong>，变量 <strong>b=21</strong>：</p>
<table>
<thead>
<tr>
<th style="text-align:left">运算符</th>
<th style="text-align:left">描述</th>
<th style="text-align:left">实例</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">+</td>
<td style="text-align:left">加 - 两个对象相加</td>
<td style="text-align:left">a + b 输出结果 31</td>
</tr>
<tr>
<td style="text-align:left">-</td>
<td style="text-align:left">减 - 得到负数或是一个数减去另一个数</td>
<td style="text-align:left">a - b 输出结果 -11</td>
</tr>
<tr>
<td style="text-align:left">*</td>
<td style="text-align:left">乘 - 两个数相乘或是返回一个被重复若干次的字符串</td>
<td style="text-align:left">a * b 输出结果 210</td>
</tr>
<tr>
<td style="text-align:left">/</td>
<td style="text-align:left">除 - x 除以 y</td>
<td style="text-align:left">b / a 输出结果 2.1</td>
</tr>
<tr>
<td style="text-align:left">%</td>
<td style="text-align:left">取模 - 返回除法的余数</td>
<td style="text-align:left">b % a 输出结果 1</td>
</tr>
<tr>
<td style="text-align:left">**</td>
<td style="text-align:left">幂 - 返回x的y次幂</td>
<td style="text-align:left">a**b 为10的21次方</td>
</tr>
<tr>
<td style="text-align:left">//</td>
<td style="text-align:left">取整除 - 向下取接近商的整数</td>
<td style="text-align:left"><code>&gt;&gt;&gt; 9//2 4 &gt;&gt;&gt; -9//2 -5</code></td>
</tr>
</tbody>
</table>
<p>以下实例演示了Python所有算术运算符的操作：</p>
<h2 id="实例python-30">实例(Python 3.0+)</h2>
<pre><code>#!/usr/bin/python3
 
a = 21
b = 10
c = 0
 
c = a + b
print (&quot;1 - c 的值为：&quot;, c)
 
c = a - b
print (&quot;2 - c 的值为：&quot;, c)
 
c = a * b
print (&quot;3 - c 的值为：&quot;, c)
 
c = a / b
print (&quot;4 - c 的值为：&quot;, c)
 
c = a % b
print (&quot;5 - c 的值为：&quot;, c)
 
# 修改变量 a 、b 、c
a = 2
b = 3
c = a**b 
print (&quot;6 - c 的值为：&quot;, c)
 
a = 10
b = 5
c = a//b 
print (&quot;7 - c 的值为：&quot;, c)
</code></pre><p>以上实例输出结果：</p>
<pre><code>1 - c 的值为： 31
2 - c 的值为： 11
3 - c 的值为： 210
4 - c 的值为： 2.1
5 - c 的值为： 1
6 - c 的值为： 8
7 - c 的值为： 2
</code></pre><hr>
<h2 id="python比较运算符">Python比较运算符</h2>
<p>以下假设变量a为10，变量b为20：</p>
<table>
<thead>
<tr>
<th style="text-align:left">运算符</th>
<th style="text-align:left">描述</th>
<th style="text-align:left">实例</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">==</td>
<td style="text-align:left">等于 - 比较对象是否相等</td>
<td style="text-align:left">(a == b) 返回 False。</td>
</tr>
<tr>
<td style="text-align:left">!=</td>
<td style="text-align:left">不等于 - 比较两个对象是否不相等</td>
<td style="text-align:left">(a != b) 返回 True。</td>
</tr>
<tr>
<td style="text-align:left">&gt;</td>
<td style="text-align:left">大于 - 返回x是否大于y</td>
<td style="text-align:left">(a &gt; b) 返回 False。</td>
</tr>
<tr>
<td style="text-align:left">&lt;</td>
<td style="text-align:left">小于 - 返回x是否小于y。所有比较运算符返回1表示真，返回0表示假。这分别与特殊的变量True和False等价。注意，这些变量名的大写。</td>
<td style="text-align:left">(a &lt; b) 返回 True。</td>
</tr>
<tr>
<td style="text-align:left">&gt;=</td>
<td style="text-align:left">大于等于 - 返回x是否大于等于y。</td>
<td style="text-align:left">(a &gt;= b) 返回 False。</td>
</tr>
<tr>
<td style="text-align:left">&lt;=</td>
<td style="text-align:left">小于等于 - 返回x是否小于等于y。</td>
<td style="text-align:left">(a &lt;= b) 返回 True。</td>
</tr>
</tbody>
</table>
<p>以下实例演示了Python所有比较运算符的操作：</p>
<h2 id="实例python-30-1">实例(Python 3.0+)</h2>
<pre><code>#!/usr/bin/python3
 
a = 21
b = 10
c = 0
 
if ( a == b ):
   print (&quot;1 - a 等于 b&quot;)
else:
   print (&quot;1 - a 不等于 b&quot;)
 
if ( a != b ):
   print (&quot;2 - a 不等于 b&quot;)
else:
   print (&quot;2 - a 等于 b&quot;)
 
if ( a &lt; b ):
   print (&quot;3 - a 小于 b&quot;)
else:
   print (&quot;3 - a 大于等于 b&quot;)
 
if ( a &gt; b ):
   print (&quot;4 - a 大于 b&quot;)
else:
   print (&quot;4 - a 小于等于 b&quot;)
 
# 修改变量 a 和 b 的值
a = 5
b = 20
if ( a &lt;= b ):
   print (&quot;5 - a 小于等于 b&quot;)
else:
   print (&quot;5 - a 大于  b&quot;)
 
if ( b &gt;= a ):
   print (&quot;6 - b 大于等于 a&quot;)
else:
   print (&quot;6 - b 小于 a&quot;)
</code></pre><p>以上实例输出结果：</p>
<pre><code>1 - a 不等于 b
2 - a 不等于 b
3 - a 大于等于 b
4 - a 大于 b
5 - a 小于等于 b
6 - b 大于等于 a
</code></pre><hr>
<h2 id="python赋值运算符">Python赋值运算符</h2>
<p>以下假设变量a为10，变量b为20：</p>
<table>
<thead>
<tr>
<th style="text-align:left">运算符</th>
<th style="text-align:left">描述</th>
<th style="text-align:left">实例</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">=</td>
<td style="text-align:left">简单的赋值运算符</td>
<td style="text-align:left">c = a + b 将 a + b 的运算结果赋值为 c</td>
</tr>
<tr>
<td style="text-align:left">+=</td>
<td style="text-align:left">加法赋值运算符</td>
<td style="text-align:left">c += a 等效于 c = c + a</td>
</tr>
<tr>
<td style="text-align:left">-=</td>
<td style="text-align:left">减法赋值运算符</td>
<td style="text-align:left">c -= a 等效于 c = c - a</td>
</tr>
<tr>
<td style="text-align:left">*=</td>
<td style="text-align:left">乘法赋值运算符</td>
<td style="text-align:left">c *= a 等效于 c = c * a</td>
</tr>
<tr>
<td style="text-align:left">/=</td>
<td style="text-align:left">除法赋值运算符</td>
<td style="text-align:left">c /= a 等效于 c = c / a</td>
</tr>
<tr>
<td style="text-align:left">%=</td>
<td style="text-align:left">取模赋值运算符</td>
<td style="text-align:left">c %= a 等效于 c = c % a</td>
</tr>
<tr>
<td style="text-align:left">**=</td>
<td style="text-align:left">幂赋值运算符</td>
<td style="text-align:left">c **= a 等效于 c = c ** a</td>
</tr>
<tr>
<td style="text-align:left">//=</td>
<td style="text-align:left">取整除赋值运算符</td>
<td style="text-align:left">c //= a 等效于 c = c // a</td>
</tr>
<tr>
<td style="text-align:left">:=</td>
<td style="text-align:left">海象运算符，可在表达式内部为变量赋值。<strong>Python3.8 版本新增运算符</strong>。</td>
<td style="text-align:left">在这个示例中，赋值表达式可以避免调用 len() 两次:<code>if (n := len(a)) &gt; 10:    print(f&quot;List is too long ({n} elements, expected &lt;= 10)&quot;)</code></td>
</tr>
</tbody>
</table>
<p>以下实例演示了Python所有赋值运算符的操作：</p>
<h2 id="实例python-30-2">实例(Python 3.0+)</h2>
<pre><code>#!/usr/bin/python3
 
a = 21
b = 10
c = 0
 
c = a + b
print (&quot;1 - c 的值为：&quot;, c)
 
c += a
print (&quot;2 - c 的值为：&quot;, c)
 
c *= a
print (&quot;3 - c 的值为：&quot;, c)
 
c /= a 
print (&quot;4 - c 的值为：&quot;, c)
 
c = 2
c %= a
print (&quot;5 - c 的值为：&quot;, c)
 
c **= a
print (&quot;6 - c 的值为：&quot;, c)
 
c //= a
print (&quot;7 - c 的值为：&quot;, c)
</code></pre><p>以上实例输出结果：</p>
<pre><code>1 - c 的值为： 31
2 - c 的值为： 52
3 - c 的值为： 1092
4 - c 的值为： 52.0
5 - c 的值为： 2
6 - c 的值为： 2097152
7 - c 的值为： 99864
</code></pre><hr>
<h2 id="python位运算符">Python位运算符</h2>
<p>按位运算符是把数字看作二进制来进行计算的。Python中的按位运算法则如下：</p>
<p>下表中变量 a 为 60，b 为 13二进制格式如下：</p>
<pre><code>a = 0011 1100

b = 0000 1101

-----------------

a&amp;b = 0000 1100

a|b = 0011 1101

a^b = 0011 0001

~a  = 1100 0011
</code></pre><table>
<thead>
<tr>
<th style="text-align:left">运算符</th>
<th style="text-align:left">描述</th>
<th style="text-align:left">实例</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">&amp;</td>
<td style="text-align:left">按位与运算符：参与运算的两个值,如果两个相应位都为1,则该位的结果为1,否则为0</td>
<td style="text-align:left">(a &amp; b) 输出结果 12 ，二进制解释： 0000 1100</td>
</tr>
<tr>
<td style="text-align:left">|</td>
<td style="text-align:left">按位或运算符：只要对应的二个二进位有一个为1时，结果位就为1。</td>
<td style="text-align:left">(a | b) 输出结果 61 ，二进制解释： 0011 1101</td>
</tr>
<tr>
<td style="text-align:left">^</td>
<td style="text-align:left">按位异或运算符：当两对应的二进位相异时，结果为1</td>
<td style="text-align:left">(a ^ b) 输出结果 49 ，二进制解释： 0011 0001</td>
</tr>
<tr>
<td style="text-align:left">~</td>
<td style="text-align:left">按位取反运算符：对数据的每个二进制位取反,即把1变为0,把0变为1。<strong>~x</strong> 类似于 <strong>-x-1</strong></td>
<td style="text-align:left">(~a ) 输出结果 -61 ，二进制解释： 1100 0011， 在一个有符号二进制数的补码形式。</td>
</tr>
<tr>
<td style="text-align:left">&laquo;</td>
<td style="text-align:left">左移动运算符：运算数的各二进位全部左移若干位，由&quot;&laquo;&ldquo;右边的数指定移动的位数，高位丢弃，低位补0。</td>
<td style="text-align:left">a &laquo; 2 输出结果 240 ，二进制解释： 1111 0000</td>
</tr>
<tr>
<td style="text-align:left">&raquo;</td>
<td style="text-align:left">右移动运算符：把&rdquo;&raquo;&ldquo;左边的运算数的各二进位全部右移若干位，&quot;&raquo;&ldquo;右边的数指定移动的位数</td>
<td style="text-align:left">a &raquo; 2 输出结果 15 ，二进制解释： 0000 1111</td>
</tr>
</tbody>
</table>
<p>以下实例演示了Python所有位运算符的操作：</p>
<h2 id="实例python-30-3">实例(Python 3.0+)</h2>
<pre><code>#!/usr/bin/python3
 
a = 60            # 60 = 0011 1100 
b = 13            # 13 = 0000 1101 
c = 0
 
c = a &amp; b        # 12 = 0000 1100
print (&quot;1 - c 的值为：&quot;, c)
 
c = a | b        # 61 = 0011 1101 
print (&quot;2 - c 的值为：&quot;, c)
 
c = a ^ b        # 49 = 0011 0001
print (&quot;3 - c 的值为：&quot;, c)
 
c = ~a           # -61 = 1100 0011
print (&quot;4 - c 的值为：&quot;, c)
 
c = a &lt;&lt; 2       # 240 = 1111 0000
print (&quot;5 - c 的值为：&quot;, c)
 
c = a &gt;&gt; 2       # 15 = 0000 1111
print (&quot;6 - c 的值为：&quot;, c)
</code></pre><p>以上实例输出结果：</p>
<pre><code>1 - c 的值为： 12
2 - c 的值为： 61
3 - c 的值为： 49
4 - c 的值为： -61
5 - c 的值为： 240
6 - c 的值为： 15
</code></pre><hr>
<h2 id="python逻辑运算符">Python逻辑运算符</h2>
<p>Python语言支持逻辑运算符，以下假设变量 a 为 10, b为 20:</p>
<table>
<thead>
<tr>
<th style="text-align:left">运算符</th>
<th style="text-align:left">逻辑表达式</th>
<th style="text-align:left">描述</th>
<th style="text-align:left">实例</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">and</td>
<td style="text-align:left">x and y</td>
<td style="text-align:left">布尔&quot;与&rdquo; - 如果 x 为 False，x and y 返回 x 的值，否则返回 y 的计算值。</td>
<td style="text-align:left">(a and b) 返回 20。</td>
</tr>
<tr>
<td style="text-align:left">or</td>
<td style="text-align:left">x or y</td>
<td style="text-align:left">布尔&quot;或&rdquo; - 如果 x 是 True，它返回 x 的值，否则它返回 y 的计算值。</td>
<td style="text-align:left">(a or b) 返回 10。</td>
</tr>
<tr>
<td style="text-align:left">not</td>
<td style="text-align:left">not x</td>
<td style="text-align:left">布尔&quot;非&quot; - 如果 x 为 True，返回 False 。如果 x 为 False，它返回 True。</td>
<td style="text-align:left">not(a and b) 返回 False</td>
</tr>
</tbody>
</table>
<p>以上实例输出结果：</p>
<h2 id="实例python-30-4">实例(Python 3.0+)</h2>
<pre><code>#!/usr/bin/python3
 
a = 10
b = 20
 
if ( a and b ):
   print (&quot;1 - 变量 a 和 b 都为 true&quot;)
else:
   print (&quot;1 - 变量 a 和 b 有一个不为 true&quot;)
 
if ( a or b ):
   print (&quot;2 - 变量 a 和 b 都为 true，或其中一个变量为 true&quot;)
else:
   print (&quot;2 - 变量 a 和 b 都不为 true&quot;)
 
# 修改变量 a 的值
a = 0
if ( a and b ):
   print (&quot;3 - 变量 a 和 b 都为 true&quot;)
else:
   print (&quot;3 - 变量 a 和 b 有一个不为 true&quot;)
 
if ( a or b ):
   print (&quot;4 - 变量 a 和 b 都为 true，或其中一个变量为 true&quot;)
else:
   print (&quot;4 - 变量 a 和 b 都不为 true&quot;)
 
if not( a and b ):
   print (&quot;5 - 变量 a 和 b 都为 false，或其中一个变量为 false&quot;)
else:
   print (&quot;5 - 变量 a 和 b 都为 true&quot;)
</code></pre><p>以上实例输出结果：</p>
<pre><code>1 - 变量 a 和 b 都为 true
2 - 变量 a 和 b 都为 true，或其中一个变量为 true
3 - 变量 a 和 b 有一个不为 true
4 - 变量 a 和 b 都为 true，或其中一个变量为 true
5 - 变量 a 和 b 都为 false，或其中一个变量为 false
</code></pre><hr>
<h2 id="python成员运算符">Python成员运算符</h2>
<p>除了以上的一些运算符之外，Python还支持成员运算符，测试实例中包含了一系列的成员，包括字符串，列表或元组。</p>
<table>
<thead>
<tr>
<th style="text-align:left">运算符</th>
<th style="text-align:left">描述</th>
<th style="text-align:left">实例</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">in</td>
<td style="text-align:left">如果在指定的序列中找到值返回 True，否则返回 False。</td>
<td style="text-align:left">x 在 y 序列中 , 如果 x 在 y 序列中返回 True。</td>
</tr>
<tr>
<td style="text-align:left">not in</td>
<td style="text-align:left">如果在指定的序列中没有找到值返回 True，否则返回 False。</td>
<td style="text-align:left">x 不在 y 序列中 , 如果 x 不在 y 序列中返回 True。</td>
</tr>
</tbody>
</table>
<p>以下实例演示了Python所有成员运算符的操作：</p>
<h2 id="实例python-30-5">实例(Python 3.0+)</h2>
<pre><code>#!/usr/bin/python3
 
a = 10
b = 20
list = [1, 2, 3, 4, 5 ]
 
if ( a in list ):
   print (&quot;1 - 变量 a 在给定的列表中 list 中&quot;)
else:
   print (&quot;1 - 变量 a 不在给定的列表中 list 中&quot;)
 
if ( b not in list ):
   print (&quot;2 - 变量 b 不在给定的列表中 list 中&quot;)
else:
   print (&quot;2 - 变量 b 在给定的列表中 list 中&quot;)
 
# 修改变量 a 的值
a = 2
if ( a in list ):
   print (&quot;3 - 变量 a 在给定的列表中 list 中&quot;)
else:
   print (&quot;3 - 变量 a 不在给定的列表中 list 中&quot;)
</code></pre><p>以上实例输出结果：</p>
<pre><code>1 - 变量 a 不在给定的列表中 list 中
2 - 变量 b 不在给定的列表中 list 中
3 - 变量 a 在给定的列表中 list 中
</code></pre><hr>
<h2 id="python身份运算符">Python身份运算符</h2>
<p>身份运算符用于比较两个对象的存储单元</p>
<table>
<thead>
<tr>
<th style="text-align:left">运算符</th>
<th style="text-align:left">描述</th>
<th style="text-align:left">实例</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">is</td>
<td style="text-align:left">is 是判断两个标识符是不是引用自一个对象</td>
<td style="text-align:left"><strong>x is y</strong>, 类似 <strong>id(x) == id(y)</strong> , 如果引用的是同一个对象则返回 True，否则返回 False</td>
</tr>
<tr>
<td style="text-align:left">is not</td>
<td style="text-align:left">is not 是判断两个标识符是不是引用自不同对象</td>
<td style="text-align:left"><strong>x is not y</strong> ， 类似 <strong>id(a) != id(b)</strong>。如果引用的不是同一个对象则返回结果 True，否则返回 False。</td>
</tr>
</tbody>
</table>
<p><strong>注：</strong> <a href="https://www.runoob.com/python/python-func-id.html">id()</a> 函数用于获取对象内存地址。</p>
<p>以下实例演示了Python所有身份运算符的操作：</p>
<h2 id="实例python-30-6">实例(Python 3.0+)</h2>
<pre><code>#!/usr/bin/python3
 
a = 20
b = 20
 
if ( a is b ):
   print (&quot;1 - a 和 b 有相同的标识&quot;)
else:
   print (&quot;1 - a 和 b 没有相同的标识&quot;)
 
if ( id(a) == id(b) ):
   print (&quot;2 - a 和 b 有相同的标识&quot;)
else:
   print (&quot;2 - a 和 b 没有相同的标识&quot;)
 
# 修改变量 b 的值
b = 30
if ( a is b ):
   print (&quot;3 - a 和 b 有相同的标识&quot;)
else:
   print (&quot;3 - a 和 b 没有相同的标识&quot;)
 
if ( a is not b ):
   print (&quot;4 - a 和 b 没有相同的标识&quot;)
else:
   print (&quot;4 - a 和 b 有相同的标识&quot;)
</code></pre><p>以上实例输出结果：</p>
<pre><code>1 - a 和 b 有相同的标识
2 - a 和 b 有相同的标识
3 - a 和 b 没有相同的标识
4 - a 和 b 没有相同的标识
</code></pre><blockquote>
<p>is 与 == 区别：</p>
<p>is 用于判断两个变量引用对象是否为同一个， == 用于判断引用变量的值是否相等。</p>
</blockquote>
<hr>
<pre><code>&gt;&gt;&gt;a = [1, 2, 3]
&gt;&gt;&gt; b = a
&gt;&gt;&gt; b is a 
True
&gt;&gt;&gt; b == a
True
&gt;&gt;&gt; b = a[:]
&gt;&gt;&gt; b is a
False
&gt;&gt;&gt; b == a
True
</code></pre><h2 id="python运算符优先级">Python运算符优先级</h2>
<p>以下表格列出了从最高到最低优先级的所有运算符：</p>
<table>
<thead>
<tr>
<th style="text-align:left">运算符</th>
<th style="text-align:left">描述</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">**</td>
<td style="text-align:left">指数 (最高优先级)</td>
</tr>
<tr>
<td style="text-align:left">~ + -</td>
<td style="text-align:left">按位翻转, 一元加号和减号 (最后两个的方法名为 +@ 和 -@)</td>
</tr>
<tr>
<td style="text-align:left">* / % //</td>
<td style="text-align:left">乘，除，求余数和取整除</td>
</tr>
<tr>
<td style="text-align:left">+ -</td>
<td style="text-align:left">加法减法</td>
</tr>
<tr>
<td style="text-align:left">&raquo; &laquo;</td>
<td style="text-align:left">右移，左移运算符</td>
</tr>
<tr>
<td style="text-align:left">&amp;</td>
<td style="text-align:left">位 &lsquo;AND&rsquo;</td>
</tr>
<tr>
<td style="text-align:left">^ |</td>
<td style="text-align:left">位运算符</td>
</tr>
<tr>
<td style="text-align:left">&lt;= &lt; &gt; &gt;=</td>
<td style="text-align:left">比较运算符</td>
</tr>
<tr>
<td style="text-align:left">== !=</td>
<td style="text-align:left">等于运算符</td>
</tr>
<tr>
<td style="text-align:left">= %= /= //= -= += *= **=</td>
<td style="text-align:left">赋值运算符</td>
</tr>
<tr>
<td style="text-align:left">is is not</td>
<td style="text-align:left">身份运算符</td>
</tr>
<tr>
<td style="text-align:left">in not in</td>
<td style="text-align:left">成员运算符</td>
</tr>
<tr>
<td style="text-align:left">not and or</td>
<td style="text-align:left">逻辑运算符</td>
</tr>
</tbody>
</table>
<p>以下实例演示了Python所有运算符优先级的操作：</p>
<h2 id="实例python-30-7">实例(Python 3.0+)</h2>
<pre><code>#!/usr/bin/python3
 
a = 20
b = 10
c = 15
d = 5
e = 0
 
e = (a + b) * c / d       #( 30 * 15 ) / 5
print (&quot;(a + b) * c / d 运算结果为：&quot;,  e)
 
e = ((a + b) * c) / d     # (30 * 15 ) / 5
print (&quot;((a + b) * c) / d 运算结果为：&quot;,  e)
 
e = (a + b) * (c / d)    # (30) * (15/5)
print (&quot;(a + b) * (c / d) 运算结果为：&quot;,  e)
 
e = a + (b * c) / d      #  20 + (150/5)
print (&quot;a + (b * c) / d 运算结果为：&quot;,  e)
</code></pre><p>以上实例输出结果：</p>
<pre><code>(a + b) * c / d 运算结果为： 90.0
((a + b) * c) / d 运算结果为： 90.0
(a + b) * (c / d) 运算结果为： 90.0
a + (b * c) / d 运算结果为： 50.0
</code></pre><p>and 拥有更高优先级:</p>
<h2 id="实例">实例</h2>
<p>x = True y = False z = False  if x or y and z:    print(&ldquo;yes&rdquo;) else:    print(&ldquo;no&rdquo;)</p>
<p>以上实例输出结果：</p>
<pre><code>yes
</code></pre><blockquote>
<p>注意：</p>
<p>Pyhton3 已不支持 &lt;&gt; 运算符，可以使用 != 代替，如果你一定要使用这种比较运算符，可以使用以下的方式：</p>
</blockquote>
<pre><code>x = True
y = False
z = False
 
if x or y and z:
    print(&quot;yes&quot;)
else:
    print(&quot;no&quot;)
</code></pre>
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            <a target="_blank" href="http://yuedu.baidu.com/ebook/14a722970740be1e640e9a3e" title="Android Gradle权威指南">Android Gradle权威指南</a>
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